cos' n ~n‘
(3/7 -1)' + yjn1 + 4 sin|/?~ - yj 7ten j
51. <7
52. a
n + 1
/?2 + sin i^n-Jn + /rj + cos ^2/7 V/? + ;r j (/? + l)(w + 2) + arctg («!+ 9)
v9 + 4/?4 + sin2 ^5 + V«4 +?/? + 4
2/r + sin
3 (V + 2/?)
\//7 +2 + sin17 (>£ + /r,; j 1 + 3 + 5 +... + {In -1)
cos31 v 2 n + y[2n+"l
tr + v2/7 +1
\/n + \/3~+ /?
V4" + 3” + n"
^5" + 7" + cos2 (« + 3)
(0.1)" +
vB
/r
53. a.
~ {n~ + 2/7 + 3)
2/72 + n + 3
77“ +3/7 + 10 j
(5/72 + /?)" (3/7' + n + l)"
1 j
n 2 + 4/7 i
ii3; v 7 J \6) UJ
n2 + n + 4 V
/72 - /? + 10 ]
3/7" +// -1 'I
:(»-2) ln^/7* + 3^ - ln^/72 + 5^J
/ 2 2(1+2 + .? + ... + /?)
= Vw +// In
|"/7+ Pl
1+345*. 4.2»-n
V « J
In (z? + 3) + In
k i \jk + }f
,12 3 n
JI- + - + - + ...+-
V 2 3 4 /? +1
65. (} —
/7' + 3
ln( 77 + 7) + In
1
77 + 10
n-1
1
+... +
1
/7‘ (/7 + 1)" (2/7+1)'
~) 1 1
n/2 + /?" \/3 + /7" \Ią +~n2
1 o
+... +
66. a.
yj 7? + 7?2 67. a,
( 3/? +• 2 ^
V 3/7 - i ;
1
1 + 2+ 3 + ...+/I /?' + 3 n + 1 2
-ii- 2*3-...- 77
/l
77 ~4 V "
(77 + 6 J
/ : -i/7 + ^ 7? — 3 i
i 77 2 +3/7 + 2 J
77 7? + 77'